From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Instruction sheet detailing the test results of Morganite narrow brushes on an M machine.
| Identifier | ExFiles\Box 60\1\ Scan037 | |
| Date | 2nd February 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.F.C. Order No.: PD 17. Customer's No.: X 8673 Test of Morganite EG6630 Narrow Brushes on M Machine. Two sets of narrow brushes in the above grade were submitted by the Morgan company for test. These brushes correspond to the Le-Carbon grade EG3417 in that they are the Morganite grade of brush containing the largest amount of lubricant without actually being impregnated. One set of these EG6630 brushes has now been tested on the bench, the test being similar to that of previous brushes. Brush wear was as follows:- | Positive | Negative | Control | |---|---|---| | Inner | .006" | .009" | .008" | | Outer | .007" | .009" | .008" | The positive brushes were dull over the Signed: Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||